Edwabd b



(No Model.)

B. R. BILLINGS.

POCKET RULE.

No. 369,499. Patented Sept. 6, 1887.

IIHJJJIIII.

WITNESSES ATTORNEYS.

NITED STATES Pan wr rricn.

EDl/VARD BILLINGS, OF NEWV YORK, N. Y.

POCKET-RULE.

SPECIFICATION forming part of Letters Patent No. 369,499, datedSeptember 6, 1887.

Application filed November 10, 1886. Serial No. 218,470. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD B. BILLINGS, of the city, county, and Stateof New York, have invented a new and Improved Pocket- Rnle, of which thefollowing is a full, clear, and exact description.

My invention relates to a pocket-rule provided with a pivoted plateconnecting two sections of the rule, whereby the rule may be used as aprotractor of angles; and the invention consists of the specialconstruction of the rule and the connections of the sliding end of thepivoted plate with the rule, all as hereinafter described.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 shows my improved rule open at a right angle. Fig. 2 shows thecentral portion of the rule fully open. Fig. 3 shows the rule open at anacute angle; and Fig. 4: is an enlarged sectional view of the ruleclcsed, taken through the sliding block, to which one end of theconnecting-plate is attached.

A represents the plate connecting the two main sections or arms, B B, ofthe rule near the central hinge orjoint, 0. One end of the plate A isattached by a pivot, a, to the arm B of the rule, while its opposite endis joined to the arm B by a sliding connection, which allows the plateto adapt itself to any angle at which the arms B B may be placed to eachother, as indicated in Figs. 1 and 3, and adapts it to permit of thefull opening and closing of the rule, as indicated in Figs. 2 and at.The sliding end of the plate A might be variously connected to the arm Bof the rule; but I prefer to connect it by means of a set-screw, b, to asliding block or nut, 12, which slides freely beneath a face-plate, d,secured to the arm B over a groove, f, formed in said arm to receive theblock or nut c. A narrow slot, 9, is formed over the center of thegroove f, to form a way for the screw 1). At the extremities of the armsB B are the points h it, so that when said arms are opened at anyangleless than a right angle and secured by turning the screw 1) therule may be used as a compass for marking and measuring circles. Theface-plate d is graduated, as shown at d, to indicate angles ofdiiierent degrees, from zero up to a right angle, so that by adjustingthe movable end of the plate A the rule may be accurately used as aprotractor.

The points h are set in shallow recesses formed at the ends of the armsB B, covered by small slotted plates 6 and held by small set-screws i,that work in the slots of the plates, so that the points may bewithdrawn within the ends of the rule when they are not required foruse.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

As an improved article of manufacture, a rule jointed at O, formingcorresponding hinged arms 13 B, the arm B having the groove fformed init and covered by the attached plate (I, having aslot, g, formed in itnarrower than the groovef, and the sliding block 0, held in the grooveby the slotted plate (I, in combi nation with the plate A, pivoted atone end to the arm B, and connected at the other by the set-screw b tothe block 0, substantially as described.

EDXVABD R. BILLINGS.

Witnesses:

. H. A. Wnsr,

O. SEDGWIOK.

